= DNS Slave =

== Network ==

We will give the DNS slave a static IP-address. Edit `/etc/networking/interfaces` and make the following changes.

{{{
# The primary network interface
#allow-hotplug eth0
#iface eth0 inet dhcp

auto eth0
iface eth0 inet static
        address 192.168.1.37
        network 192.168.1.0
        netmask 255.255.255.0
        broadcast 192.168.1.255
        gateway 192.168.1.1
}}}

== Install BIND ==

{{{
apt-get install bind9
}}}

== Configure BIND ==

=== Stop BIND ===
{{{
service bind9 stop
}}}

=== Make BIND listen ===

edit `/etc/bind/named.conf.options` and add

{{{
listen-on { any; };
allow-notify { 192.168.1.37; };
}}}

=== Get the DDNS update key ===
Get the key from the master and save it in `/etc/bind/ddns-update.kallenberg.dk`.
{{{
key "ddns-update" {
        algorithm hmac-sha512;
        secret "yYFzfibvlpS33+vsngV2jF5tGkTiVSjhYoFuV0T7bnCVfFGx3Mu05SW+LakImdofkNM00LxHCLuvD1W1vSWMmA==";
};
}}}

Make sure BIND can read `/etc/bind/ddns-update.kallenberg.dk`.
{{{
chown root:bind /etc/bind/ddns-update.kallenberg.dk
}}}

=== Create a new zone ===
`/etc/bind/named.conf.kallenberg.dk`
{{{
# Key used by DHCP servers for dynamic DNS updates
include "/etc/bind/ddns-update.kallenberg.dk";

zone "kallenberg.dk" {
        type slave;
        masters { 192.168.1.36; };
        file "/var/lib/bind/kallenberg.dk.zone";
        allow-transfer { 192.168.1.36; };
};

zone "1.168.192.in-addr.arpa" {
        type slave;
        masters { 192.168.1.36; };
        file "/var/lib/bind/1.168.192.zone";
        allow-transfer { 192.168.1.36; };
};
}}}

Add the new zone file to `/etc/bind/named.conf.local`
{{{
include "/etc/bind/named.conf.kallenberg.dk";
}}}


`/var/lib/bind/kallenberg.dk.zone`
{{{
$ORIGIN .
$TTL 86400      ; 1 day
kallenberg.dk           IN SOA  ns01.kallenberg.dk. ns02.kallenberg.dk. (
                                20171210   ; serial
                                7200       ; refresh (2 hours)
                                300        ; retry (5 minutes)
                                604800     ; expire (1 week)
                                60         ; minimum (1 minute)
                                )
                        IN      NS      ns01.kallenberg.dk.
                        IN      NS      ns02.kallenberg.dk.
                        A       212.237.182.56
$ORIGIN kallenberg.dk.
$TTL 86400      ; 1 day
ns01    IN      A       192.168.1.36
ns02    IN      A       192.168.1.37
}}}

`/var/lib/bind/1.168.192.zone`
{{{
$ORIGIN .
$TTL 86400      ; 1 day
1.168.192.in-addr.arpa  IN SOA  ns01.kallenberg.dk. ns02.kallenberg.dk. (
                                20171210   ; serial
                                7200       ; refresh (2 hours)
                                300        ; retry (5 minutes)
                                604800     ; expire (1 week)
                                60         ; minimum (1 minute)
                                )
                        IN      NS      ns01.kallenberg.dk.
                        IN      NS      ns02.kallenberg.dk.
$ORIGIN 1.168.192.in-addr.arpa.
36      IN PTR ns01.kallenberg.dk
37      IN PTR ns02.kallenberg.dk
}}}


=== Start BIND ===
Finally start the service again
{{{
service bind9 start
}}}